Filter



June 28 .1927' A. w. KoGsTRoM FILTER Filed June 4, 1925 le also an object of the invention'to produce Patented ilunef28,'1i9v27.

entran srATES israele lParaNT orFlce.

`AXEL W. Rossmann; oF UPPER DAFBY, PENNSYLVANIA, Assumer. or ONE-HALF 'ro ALLISQN.F.\H; SCOTT, F PHILADELPHIA,'IENNSYLVANIA.

FILTER.

`applicaties mea June i, 1925. serialA at, 35,019.`

@This invention relates to lilters and in particular' to affilier to be used for filtering out the impurities'in the liquid fuel supply for gas engines and the like. i

@j @ne object of the inventionis to produce a self contained filter device which cany be' readily inserted in theK fuel supply 'pipe of gas engines or any. other liquid supply from l which impurities are to be removed'. ltr is such av device with simple construction to facilitate its manufacture, its assembly, and to 'reduce' the number of removable' parts to afminimurn..y le `Another object is toconstruct a filter device in which the filter unit proper is'made asfa unitary structure which maybe readily removed from the filter casing, thus the fil- 'ter units may be conveniently .bought sept'arately.y and-replaceable in the event they become clogged or ineiiicient after long serv- Another object is to so wconstructs theA filter Vunit that it will have a relatively large filtering area in comparison with other filters of .the same size.

ln the drawings:

Figu 1 is a sectional view showing the assembly of the invention in elevation;

Fig. 2 is a horizontal sectional view taken along line 2-2 of Fig. 1.

Fig. 3 is a view showing the under side of the filter head or cap.

Fig. shows a wire spacing element used in the assembly of thelter unit to aid in maintaining the filtering surfaces in proper relation. p l Fig. 5 shows the details ofthe upper and lower supporting -rings upon which the filter material is mounted.

ln Fig. 1, the main casing of the filter 1s in the form of a bowl or cup 1, which may be formed fromsheet metal by drawin or otherwise. rlhe bowl is provided wit a cover or cap2, and an air-tight joint is provided between the two by means of the washer 3., A drain cock l1 is soldered or otherwise secured to the bottom of bowl 2, and a rod 5 is securely held in the upper end of cock e.' The upper `end of rod 5 extends into the filter casing, through a hole inthe cap 2, and is provided .with a thumb nut 6 for tightly clamping the cap upon the bowl. A. washer 7 isv provided under the nut 6 to malte an l airtight `ioint around the hole inthe lter cap..

The cap 2 isV provided sage 8 which communicates directly' with the interior of `the bowl 1 by-,means 'of passage 10. An outlet passage .9: isalso provided in cap 2, and is connected at its inner end with an annular groove 11, formed in with 1an inlet pas- I the under side of the cap and located di 4rectly above'the filter unit.y

The filter unit assembly proper consists of members or. elements 12, 13, 14, 15, 16 and 17. ln this ,unitfelement 12 is an up per ring of substantially arectangular crosssection with the upper side open, as shown in Figs. 1 and 5. The upper edges of ring 12 abut against the lower'face of cap 2, to v form a seal around the annular groove 11.e

A filter element 15, in the form of artorusf shaped bag, is supported from ring 12 by means of two spring rings 16 and 17 which tightly press the upper edges of the filter bag 'into grooves l2a and 12barranged respectively on the outer and inner sides of ring 12. This particular form of filter bagy a'ords a filtering surface equal to a plain cylindrical bag having a diameter' equal to the mean diameter of the two walls and of twice the length. Thus for any given diameter and length of bowl the torus-shaped bag affords substantially twice as much filtering surfacevas a plain cylindrical bag. This filter bag is made of chamois or any other suitable filter material. The bag 15 extends downwardly from ring 12, and in order to prevent is from collapsing during operation a lower ring 13, is provided at the bottom of the bag to separate the walls. The lower ring 13 is maintained in spaced relation to the upper ring 12 by means of the resilient spacing element 14, which is set in'grooves provided in the rings for this purpose (see se d ss i

The filter unit assembly is maintained in position against the under side of cap 2, by means of a spider 18, supported upon a shoulder 5a' forrmedfon rod 5. lThe outer ends of the fingers of spider 18, engage the lunder side of clampingring 17, andpress the filter unit tightly against the under side of the cap 2. The spider 18 may be made of any suitable resilient material. -f

A series'of holes 19 are formed around the and, together with the unit, is slipped over"k the end of rod A and seated 011 the shoulder 5a. The cap 2, may then be positioned over the rod 5, after having placed washer 3 in position, and nut 6 is screwed on to the 0nd of rod 5 to force the filler unit down against admitted through the intake passage 8 to' 30 the tension of spider 18 and to form a tight joint between bowl 1 and cap 2. The abutting surfaces of cali 2 and ring 12 are ground or otherwise machined to afford a tight joint between the two. to maintain a tight joint between cap 2 and the filter unit, but also between the cap and the bowl.

It will thus be seen that a construction is obtained in which only threeprincipal elements are involved, that is, thebowl, the filter Yunit andthe cap, and `only a single fastening means is used to hold. these elements in their proper assembled relation,

The operation of the filter is as follows Fluid to be filtered, such as gasolene, is

the bowl l. The fluid may be either forced into the bowl under pressure or drawn` through ,by a vacuum. The fluidk will com'- pletely fill the bowl and will be in contact with the entire outer surface orA walls of the filter bag 15. The gasolene will filter to, the inside o and oute walls, and, under the action of the pumpingl system, will be either forced or drawn through the holes 19 to groove 11, and 'thence through the outlet passage y9. Any foreign substances in the' fluid will either settle to the bottom of the bowl 1 or be filtered out by the bag 15. Sediment which collects in the bottom of the bowl may be drained off by opening cock 4.'

It is apparent that the use of a torusshaped filter.. bag, as shown, instead of a plain bag or a cylindical lter surface permits of considerably more filter surface area being enclosed in a casing of any given size.

Should a filter unit become useless for any reason, the construction employed inmy in vention permits of substituting a new unit without the use of tools of any kind and with greatest dispatch.

1. A filter comprising a Settling chamber and a cap therefor provided with -inlet and outlet passages, means forclamping the cap to the chamber, a filter element, and means including said' clamping'means anda flexible spider supported. thereon for resiliently,

holding the ,filter element over the outlet passage.

2. A lter comprising a settling chamber The nut 6 serves not onlyA the bag through both the inner and a cap therefor provided with inlet and outlet passages, means for clamping the cap 'to the ehambenfa filter element, and means including said clamping means and a flexible spider supported thereon for positioning the filter element over the outlet passage and resiliently holding it against the cap.

3. A filter unitco'mprising an upper supporting ring having a cup-shaped cross-Section, an annular filter bag supported by its 'edges from the inner and outer walls of the upper ring, alower ring in the bottom of the bag, and a spacing element maintaining the two rings in spaced relation.

4:. A filter unit comprising a torusshaped bag `open at the top and having two concenthe lower end thereof, the lower one of said ing a passage `to the annular space between the filter walls. 'i

5. A filter-.unit comprising an' annular filter bag, a lowersupporting'ring in the bottom of the bag, an uppersupporting ring inserted in the mouth of the bag, means for securing the walls of the bag to the upper ring, a groove in the lower side of the upper ring, a roove in the upper side of the lower ring an a spacing element inserted between the two rings and in the ooves. v 6.- A filter unit comprising an annular filter bag,` a lower supporting ring in the bottom of the bag, an upper supporting ring inserted in the mouth of the bag, means for securing the walls of the bag to the ulpper ring, a groove in the lowerside of t e upper ring, a .groove in the upper side of the lower ring and a spacing .element inserted between the two rings and in the grooves, said spacing element comprising a wire eX- tending from one groove tothe other progressively and at spaced intervals around the filter unit.

7 A filter comprising a settling chamber and a cap therefor provided with inlet and outlet passages, one of said passages being in the form of an annular groove on the under side of the cap, a filter unit compris-- ,las

side of the cap, means for clam-pingthe cap tothe chamber, a filter unit vc zomprising an annular lter bag, and means mcludmg sa1d olampingdmeans for positioning Vthe mouth of the bag overvthe outlet groove and Are-` siliently holding it against the cap., f

9. A filter comprising a settling chamber and a cap therefor provided 'with inlet and outlet passages, the outlet'pass'age including an annular groove on the under side of the cap, a rod secured yto the bottom of 'the chamber and extending; upwardly through `the Cap, a filter unit Within the chamber C0m' v prising an annular filter bag coneentrlo w1th the rod and means for supporting the bag from the rod With its mouth over ythe outlet `groove in the cap, said means oomprising'a resilient spider supported from the rod` a nut provided atthe upper end of the rod for clamping the cap to the chamber, the spider being so positioned on the rod that as the cap is clamped upon the chamber it first engages the lter unit and forces it down against the action of the spider to resiliently holdthe filter unitlagainst the cap.

10., A filter comprising a settling chamber and a cap therefor provided with a passage in the form of an annular groove on the underside of the cap, an annular filter element, and means for positioning the filter unit over the outlet, groove and holding it against the c-ap adjacent boththe inside and outside edges of the groove.

11. A filter eornpnsing asettling chamber anda cap ,therefor provided with inlet and outlet passages, one of said p'assagesbeing inthe form of an annular groove on the underside of thel cap, an annular filter elelment comprising concentric ylindrioal Walls of the filter material having an annular spatie therebetween and being closed at one end and open `at the other, and means `for `positioning the vopen end of Ithe filter over independent of the Walls of said cup-shaped.

Container element for supporting the filter element in engagement with the cap with the opening in the `filter registering With one in said ca of the passages p i AXEL W; KOGSTROM. 

